Open the Edge-Mag and place a knife with the edge aligned to the inside lip with the bolster flush against the tapered end. Close the Edge-Mag like a book and the knife edge should be completely covered. To remove, open carefully like a book, holding the knife by the handle. The Edge-Mag is manufactured with multi poled magnets that cannot magnetize your knife. They utilize complex magnetic fields that alternate every 1/8-in and cannot permanently align the poles in any magnetically receptive object.